Pulp-grinding stone.



J. J. CASE. PULP GRINDING STONE. APPLIOATION FILED SEPT. 8, i913.

Patented Mar. 24, 1914.

atfozneq away; and Fig. 2 is a vertical UNITED STATES PATENT OFFICE.

JOI-INJEROME CASE, OF FORT EDWARD, NEW YORK.

PULP-GRINDING STONE.

To all whom it may concern.

Be it known that I, JOHN- J. CAsE, a citizen of the United States, and aresident of Fort Edward, in the county of Washington, State of New York, have invented certain new and useful Improvements in Pulp- Grinding Stones, of which the following is a full and clear specification, reference being had to the accompanying drawings, in which- Figure 1 is a side elevation, partly broken sectional view of a structure embodying the preferred manner of carrying out my invention.

This invention has relation to that class of pulp grinding stones in which the stone is of an artificial nature, molded to form while the material is in a ject of this invention is to provide simple and eflicient means whereby the stone may be readily and rigidly, as well as accurately, attached to the grinder shaft, these meanspermitting the stone to be readily detached from the shaft and replaced by a new stone, when the stone has become worn down below working size, as more fully hereinafter set," forth.

Referring to the drawings by referencey characters, a designates the usual shaft of the grinder and Z) designates a cylindrical hub fastened to the shaft by a key 0. At one end of the hub is formed an annular abutment flange d and at a point adjacent to this flange the annular surface of the hub is beveled at c, this bevel serving to give to this part of the hub a conical shape, the base of the cone being at the juncture of the hub and the flange d. At the opposite end of the hub it is provided with an annular beveled surface f, the direction of this bevel being inward toward the end of the hub.

Upon the above described hub, the grinding stone is adapted to be fitted. In the present instance, this stone consists of a sleeve or metal ring 9, which is approximately the length of the hub and at its ends is provided with annular flanges h, these flanges forming a sort of annular channel for the reception and retention of the arti ficial stone materia 2' which is molded into the channel while in a plastic'state. For the purpose of strengthening and reinforcing the stone, I provide the sleeve 9, about midway its length, with an additional annular flange j and with small rods 71:, these rods 7: being mounted in the flange j and lying ap- Spec ification of Letters Patent. Application filed September 8, 1913. Serial No.

Patented Mar. 24, 1914. 788,777.

one end of the ring or sleeve 9 abuts against hub flange d, and, to force the stone inwardly upon the hub ,to bring the surfaces of the ring or sleeve 9 into rigid abutting relation-to the said flange d and conical enlargement e, I employ a clamping ring m which is removably secured' to the opposite end of the hub by means of bolts n and plastic state, and the ob- -Avhich overlaps upon the adjacent face of the flanges h of the ring or sleeve 9, so that by tightening the bolts n the clamping ring m 1s drawn tightly against the face 01' end of the sleeve 9 and thus jams said ring or sleeve inwardly against the flange (Z and the conical surface 6. For convenience in applying and in removing the clampring m, it is pref erably constructed in two semi-circular sections, and, in order that the stone shall be locked against rotative movement of the hub, I provide the end faces of the ring 9 with bosses or lugs 0 and provide the flange cl and the clamp ring 111. with marginal recesses for the reception of said bosses or lugs. o provide for accurate centering of te stone when it is clamped in place, I provide the clamp ring m, on its inner face, with a wedge-shaped inwardly projecting annular flange 79 which, when the clamp ring is bolted home, will be forced inwardly between the beveled annular face f formed on the adjacent end of the hub and an oppositely beveled face formed on the interior of the adjacent end of the stone-carrying sleeve 9. It will be seen that when the clamp ring 1s drawn up by means of-the abutment n, the beveled surfaces will not only cause radial tightening action, but will also insure the perfect centering of the stone on the grinder shaft.

A feature of great importance is that with my construction the stone and its carrying ring or sleeve as well as the reinforcements perform a unitary structure which is adapted to be placed on the shaft and removed therefrom as a unit, and which effectually prevents all the strains of rigidly clamping the stone to the hub from being transmitted to the stone-making material, thereby permitting the stone to be rigidly clamped in place without injuring it.

Having thus described my invention, what I claim is' 1. In a pulp grinding device, the combination of a shaft, a hub thereon, a pulp stone structure embodying a metallic sleeve adapted to fit over said hub and carrying an artificial stone body molded thereon, and means for clamping, as Well as centering, the pulp stone structure, said meansserving to interlock said hub with said ring of the pulp stone structure.

2. In a pulp grinding device, the combination of a shaft, a cylindrical hub afiixed thereto and'having an annular beveled surface at each end, a metallic ring carrying a pulp stone and adapted to fit over said hub,

said ring having an annular beveled surface JOHN JEROME CASE.

Witnesses:

GEORGE W. WAIT, B. M. Ronnnrs. 

